pigs at a fair

A handler watches over pigs at the San Fernando Valley Fair in 2002. This year, at least 145 people have become sick with H3N2 variant influenza -- most after exposure to pigs at agricultural fairs.

A handler watches over pigs at the San Fernando Valley Fair in 2002. This year, at least 145 people have become sick with H3N2 variant influenza -- most after exposure to pigs at agricultural fairs. (Myung J. Chun / Los Angeles Times)

A handler watches over pigs at the San Fernando Valley Fair in 2002. This year, at least 145 people have become sick with H3N2 variant influenza -- most after exposure to pigs at agricultural fairs.